I would go for the planet 2000 and make sure that there's a remote suplied. If you look around now at dealers you may find some at used prices when they are ex demo or even new and with full warrenty due to the coming of the new Apollo. Witch ever one you choose though they are all very well regarded players. Planet 2000 also is said to have better bass then then the new Apollo although this has some other merrits.
There's a guy on PFM who has just picked up a mk1 Planet and says it's not that far behind his Saturn in terms of performance. I can't comment on that, but I can say that £250 is way over the odds for an original Planet. I picked one from eBay for £130 and was expecting to pay no more than £150.
The Apollo is a fantastic cd player which is capable of giving far more expensive players a good run for the money (especially in terms of resolution and timing).